Can you only talk to people within X IQ of your own?
There is this claim sometimes seen when discussing highly gifted people. One interested reader emailed me to ask where it was that Arthur Jensen made this claim: Anyway, what I…
New study: Intelligence and Group Differences in Preference for Breasts over Buttocks
George Francis and I have a new exciting study out, the formal and finalized version of George Francis' 2022 blogpost: Francis, G., & Kirkegaard, E. O. W. (2023). Intelligence and…
New study out: Systemic Racism Does Not Explain Variation in Race Gaps on Cognitive Tests
The new issue of Mankind Quarterly just came out. It appears I have no less than 6 pieces in this, so let's get started. Kirkegaard, E. O. W. (2023). Systemic…
Measurement error and group differences explained
I have often talked about how measurement error impacts correlations between two variables. Here we are talking about classical measurement error, which is theoretically understood as adding a normally distributed…
Heritability, within and between groups
There is a new preprint that's making the rounds on Twitter: Schraiber, J. G., & Edge, M. D. (2023). Heritability within groups is uninformative about differences among groups: cases from…
What if somewhere, someone used to look at their polygenic scores?
Undark magazine has a new piece out where a journalist expresses concern about people looking at their own DNA results: From a Fledgling Genetic Science, A Murky Market for Prediction.…
National “learning-adjusted years of schooling”
We've recently seen national "basic skills" and Team Economist is now back with another one: National "learning-adjusted years of schooling". We might say that national intelligence enjoys a paradoxical popularity.…
Sasha Gusev won’t answer basic questions about his beliefs
Sasha Gusev is a statistical geneticist who spends a lot of time on Twitter. He has been attacking various behavioral genetics studies lately, thus earning some ire from people in…
Palestinians in your country: what to expect?
With a war looming and probably lots of Palestinian refugee applications on the horizon, I thought it would be wise to summarize what we have so far about them. The…
Carl Brigham on intelligence (1923): a fake quote
On various socialist and egalitarian writings as well as the academic literature, one can find attacks on intelligence testing due to the bad early guys. One common example is Carl…
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